A Purpose Built Vehicle

John Brock owns the car he and Mike Klensin built and race.

They knew each other from being in the business. John owns Rocking J Offroad, LLC, in Tucson; he specializes in rock crawler chassis fabrication, modification, and drive trains.

(John Brock, Owner/Driver)

Mike owns Crossed-Up Customs, also in Tucson; he’s a chassis specialist who manufactures components for the off-road industry.

(Mike Klensin, Driver)

John explains, “Mike built the chassis for this car, I bought it from him. I installed the wiring, drive train, etc. This is a purpose-built vehicle, strictly for the combination between desert racing and rock crawling. Some of the vehicles are built more for desert, some for rock; mine tends to be built more for the rock crawling. It does better crawling through the rocks, but is not quite as fast on the desert. I give up a little speed there so I can go quicker through the rocks.

The suspension is triangulated 4-link suspension, front and rear. The engine is a Chevy LS3 motor. It’s been modified somewhat; not a whole lot. The transmission is a Chevy automatic transmission, a Turbo 400. And it is built specifically for this type of racing.

The front and rear differentials are prototypes that are made by Sixty9 Axle; they’re a brand new design that’s just come out within the last few months. I’ve been running these for two years, testing for them. I’ve been very happy with them, no issues. The tires are BF Goodrich, specifically for rock crawling. They are race-only, competition-only tires.”

The racing shocks are made by ADS out of Tucson, AZ. “The shock absorbers are what they call a four tube bypass and they are externally adjustable; we don’t have to disassemble to adjust, we can adjust per the track conditions.

It’s expensive to race this, but that’s what I like to do; and that’s why I do it.”

(John collecting the new buggy from Crossed Up Offroad)

Follow the racing action at Team Crossed-Up Offroad –
https://www.facebook.com/RockingJOffroadRaceTeam